Call of Duty: Modern Warfare 2 - Multiplayer
33.4 hrs last two weeks / 109.6 hrs on record
Team Fortress 2
14.5 hrs last two weeks / 179.4 hrs on record
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Altitude
1.3 hrs last two weeks / 14.4 hrs on record
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Half-Life 2: Deathmatch
1.3 hrs last two weeks / 214.3 hrs on record
Call of Duty: Modern Warfare 2
8.7 hrs on record
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Counter-Strike: Source
5.6 hrs on record
Day of Defeat: Source
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Garry's Mod
21 hrs on record
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Grand Theft Auto IV
6.2 hrs on record
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two
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Half-Life 2: Lost Coast
Killing Floor
25.3 hrs on record
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Killing Floor Mod: Defence Alliance 2
0.1 hrs on record
Killing Floor SDK
1.6 hrs on record
Left 4 Dead
159.1 hrs on record
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Left 4 Dead 2
19.9 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead Authoring Tools
Portal
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Source SDK
1.1 hrs on record
Unreal Tournament 3 Black
21.9 hrs on record
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